wordwrap.cc wouldn't compile because of "undefined reference to strlen()" (approx).
Kludged by inserting
This probably violates your portabiilty concepts, and duplicates includes in other some modules,
such as tblock.cc which has ifdef-ed includes,
but it "just seemed simpler" (for me) to put the include close to the usage-point.
Anyway, best regards, and keep up the good work!